D'Arrest is a lunar

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

that is located in the

lava Lava is molten or partially molten rock ( magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or ...

-flooded region to the west of the

Mare Tranquillitatis Mare Tranquillitatis ( Latin ''tranquillitātis'', the Sea of Tranquillity or Sea of Tranquility; see spelling differences) is a lunar mare that sits within the Tranquillitatis basin on the Moon. It is the first location on another world to ...

. It is named after the German astronomer

Heinrich Louis d'Arrest Heinrich Louis d'Arrest (13 August 1822 – 14 June 1875; ) was a German astronomer, born in Berlin. His name is sometimes given as Heinrich Ludwig d'Arrest. Biography While still a student at the University of Berlin, d'Arrest was pa ...

. It lies to the southeast of the crater

Agrippa Agrippa may refer to: People Antiquity * Agrippa (mythology), semi-mythological king of Alba Longa * Agrippa (astronomer), Greek astronomer from the late 1st century * Agrippa the Skeptic, Skeptic philosopher at the end of the 1st century * Agr ...

and northwest of Delambre. Just to the northeast are the small, bowl-shaped craters

De Morgan De Morgan or de Morgan is a surname, and may refer to: *Augustus De Morgan (1806–1871), British mathematician and logician. ** De Morgan's laws (or De Morgan's theorem), a set of rules from propositional logic. ** The De Morgan Medal, a trienn ...

and Cayley. The outer rim of D'Arrest is broken in several places, with a gash at the south end and a wide gap to the northeast where only a low ridge remains in place of the original wall. The interior has been resurfaced by

, leaving a nearly flat, featureless floor. The surviving rim is low and worn, with ridges connecting it to the south and southwest.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to D'Arrest.

References

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External links

D'Arrest at The Moon Wiki

Satellite craters

References

External links

Other articles